Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6161dcb2582e04…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b72e644bc5225a73be6b07ec37f782f SHA-1: 390a87bfed30b05b1d01df886fccb7a67f3b17c6 SHA-256: 7c6161dcb2582e040c8790a0af4dbab7569234ce6b256d5c5206aff332e02b2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This structure strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5296

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=how+to+change+app+icon+in+android+phone PDF link annotation
    • http://evohome.pl/userfiles/file/zigadugozizijoxifuxa.pdfIn PDF document text
    • https://proia.bg/userfiles/file/37890370605.pdfIn PDF document text
    • https://tsegypt.com/file/49416563402.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/tirekajegubawuli.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090414073270554.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vruq4hsnin9ndecslcr8mfc298/87642314824.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/82345359060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8af4acea4---29117676248.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/50685193600.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/kazatifi.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/22724435691.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/murenanedosixezasef.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_171016.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/tokoxapadawedumevazejuz.pdfIn PDF document text
    • https://taperagi.com/contents/files/sikefukefuf.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d225a763---rarigatudodinutibeworuli.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15762556689.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/rajavawenirorajobibixesu.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/43763902666.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/digajejipimip.pdfIn PDF document text
    • https://airxps.com/userfiles/files/patumawefifoxikilibuf.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ded3a495---41436401379.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mowog.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/54758302204.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 10656 bytes
SHA-256: b447915cf84fd1a72f4f5a37365e6ffb288ca93cf1dcc330b5e5e859c783d0c8
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 18144 bytes
SHA-256: 78d88406fc92fa7ffdd0560174b904328848a375755fe372328c8aed9e3a5a2b

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